Preparation and characterization of pillared montmorillonite: application in adsorption of cadmium

Enhanced sorption of radiocobalt from water by Bi(III) modified montmorillonite: A novel adsorbent

“…Cr(VI) sorption was enhanced by the presence of poly-hydroxyl zirconium on montmorillonite [14]. Bouchenafa-Saïb et al [15] found that the Al pillared montmorillonite has a better affinity towards Cd(II) compared to the raw montmorillonite. However, to the best of our knowledge, the study of Bi pillared montmorillonite, especially its application on the sorption of radiocobalt, is still not available.…”

“…Nowadays, a variety of pillared montmorillonites have been used to remove heavy metals from wastewater [13][14][15][16][17][18][19]. Cd(II) sorption was increased by the presence of poly-hydroxyl ferric on montmorillonite [13].…”

Removal of Pb(II) from aqueous solution using modified and unmodified kaolinite clay

“…metals such as Fe(III), Co(II) and Ni(II) from aqueous solution have been reported [9][10][11][12][13]. The removal of metal ions using kaolinite clay is based on ion exchange and adsorption mechanisms as it has a low cation exchange capacity (CEC) (15-75 mmol/kg of clay) and small surface area commonly ranging from 10 to 20 m 2 /g [10].…”

“…Clays pillared with metal oxides are of great importance because of their high thermal stability, high surface area, and intrinsic catalytic activity [12]. Numerous cations (hydroxyl aluminum and zirconium) [13], have been used for the preparation of pillared clay, which have a high sorption capacity of heavy metals at adequate pH. As an alternative technique, chemically modified clay minerals represent a new class of adsorbents for water purification and industrial wastewater treatment [14].…”

Removal of nitrate by zero-valent iron and pillared bentonite

“…If only iron metal cations were considered, the cation exchange mechanism could be used to explain their adsorption by clays [43]. In the case of bentonite pillared with poly(hydroxo Al(III)) cations, the adsorption occurred in the manner of displacement of protons from surface hydroxys by iron cations (Fe 2+ and Fe 3+ ), which was accompanied by the H + release [44,45]. The released protons could help to improve the Fe(0) activity in the following ways: (1) the nitrate reduction could continue with high reaction rate; (2) the removal efficiency could be kept at nearly 100% for a period.…”